drivers/nble: Use flags for state tracking

Using atomic flags instead of bool allows adding new states easily
without aditional memory footprint.

Change-Id: I0289a49af8353dc832a33e16ebdd6651c3913fe3
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>

drivers/bluetooth/nble/conn.c

@@ -419,7 +419,7 @@ static void notify_disconnected(struct bt_conn *conn)
 	 * FIXME: When disconnected NBLE stops advertising, this should
 	 * be fixed in the NBLE firmware, use this hack for now
 	 */
-	if (nble.keep_adv) {
+	if (atomic_test_bit(&nble.flags, NBLE_FLAG_KEEP_ADVERTISING)) {
 		BT_WARN("Re-enable advertising on disconnect");
 		nble_gap_start_adv_req();
 	}

drivers/bluetooth/nble/gap.c

@@ -217,7 +217,7 @@ void on_nble_gap_start_adv_rsp(const struct nble_common_rsp *rsp)
 		return;
 	}
 
-	nble.keep_adv = true;
+	atomic_set_bit(&nble.flags, NBLE_FLAG_KEEP_ADVERTISING);
 
 	BT_DBG("status %u", rsp->status);
 }
@@ -238,7 +238,7 @@ void on_nble_gap_stop_advertise_rsp(const struct nble_common_rsp *rsp)
 		return;
 	}
 
-	nble.keep_adv = false;
+	atomic_clear_bit(&nble.flags, NBLE_FLAG_KEEP_ADVERTISING);
 
 	BT_DBG("status %d", rsp->status);
 }

drivers/bluetooth/nble/gap_internal.h

@@ -583,11 +583,15 @@ void ble_gap_set_rssi_report(struct ble_rssi_report_params *par,
 			     struct bt_conn *conn,
 			     rssi_report_resp_t resp_cb, rssi_report_t evt_cb);
 
+enum {
+	NBLE_FLAG_KEEP_ADVERTISING,
+};
+
 struct nble {
 	/* Local Bluetooth LE Device Address */
 	bt_addr_le_t addr;
 	const struct bt_conn_auth_cb *auth;
-	bool keep_adv;
+	atomic_t flags;
 };
 
 extern struct nble nble;

drivers/bluetooth/nble/rpc_deserialize.c

@@ -16,6 +16,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <atomic.h>
 
 #include <bluetooth/gatt.h>
 /* for bt_security_t */

drivers/bluetooth/nble/rpc_serialize.c

@@ -15,6 +15,7 @@
  */
 
 #include <string.h>
+#include <atomic.h>
 
 #include <bluetooth/gatt.h>
 #include <bluetooth/conn.h>

drivers/bluetooth/nble/stubs.c

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <atomic.h>
+
 #include <bluetooth/gatt.h>
 #include <bluetooth/conn.h>
 #include <bluetooth/log.h>